72 lines
2.2 KiB
FortranFixed
72 lines
2.2 KiB
FortranFixed
subroutine targetgridsampling(sampfunc,nparams0,
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& msect0,bestguess,yatguess,bmax0,bmin0,iflag)
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implicit none
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!
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!iflag(i)=0, fix bestguess(i) at the input value
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!iflag(i)=1, bestguess(i) is not provided an input value. use grid search
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integer nparams0,msect0,iflag(nparams0)
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double precision bestguess(nparams0),
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& bmax0(nparams0),bmin0(nparams0),
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& params(nparams0,msect0+1),yatguess,
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& beta(nparams0),fatbeta,bmax(nparams0),bmin(nparams0)
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integer i,j,k,n,msect,m,nparams,itag(nparams0)
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double precision tiny,x1,delta,eps
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parameter(eps=1.0d-8)
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external sampfunc
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!
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nparams=0
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do i=1,nparams0
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if(iflag(i).eq.1)then
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nparams=nparams+1
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bmax(nparams)=bmax0(i)
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bmin(nparams)=bmin0(i)
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itag(nparams)=i
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endif
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enddo
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msect=msect0
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do i=1,nparams
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tiny=(bmax(i)-bmin(i))*eps
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x1=(bmax(i)-bmin(i)-2.0d0*tiny)/dble(msect)
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params(i,1)=bmin(i)+tiny
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do j=2,msect+1
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params(i,j)=params(i,j-1)+x1
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params(i,j)=dmax1(params(i,j),bmin(i))
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params(i,j)=dmin1(params(i,j),bmax(i))
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enddo
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enddo
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msect=msect+1
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yatguess=1.0d+100
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do i=1,msect**nparams
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do j=1,nparams
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!the size of the larger repeated unit is msect**(nparams-j+1)
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k=i/(msect**(nparams-j+1))
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n=mod(i,(msect**(nparams-j+1)))
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if(n.eq.0)k=k-1
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!k is the number of repeated units before i (not include the unit i is in)
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k=i-k*(msect**(nparams-j+1))
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!now k is the position in the larger repeated unit
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!the size of the smaller repeated unit is (msect**(nparams-j+1))/msect
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m=(msect**(nparams-j+1))/msect
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n=k/m
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if(mod(k,m).ne.0)n=n+1
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beta(j)=params(j,n)
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enddo
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do j=nparams,1,-1
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beta(itag(j))=beta(j)
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enddo
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do j=1,nparams0
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if(iflag(j).eq.0)then
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beta(j)=bestguess(j)
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endif
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enddo
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call sampfunc(nparams0,beta,fatbeta)
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if(fatbeta.lt.yatguess)then
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yatguess=fatbeta
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do j=1,nparams0
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bestguess(j)=beta(j)
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enddo
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endif
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enddo
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return
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end
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